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Problem with Spec 128k +2 !! Noob calling for help!Hi there, I have an spec 128k +2 which was working fine, played with him yesterday and today when i tried him again he gave me this [URL="http://go…
a typical crash... failure of ram, ula or anything :P
(we got those answers from this forum all the time) -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... ) nutshell:
Change the ULA.
If no picture ... after modulator swop, recheck the ULA and change TR1/2 (replace ... with BC547) if ULA ok. Change the LM1889 if ... will cure 99% of Speccy faults. Whilst you're doing this ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... />
I also pull the ULA out because I get the ... for testing certain classes of faults, probably with a character LCD ... all of RAM and the ULA in cases where they've ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... you haven't damaged those ULA chips.
... :
Change the ULA.
If no picture ... modulator swop, recheck the ULA and change TR1/2 ( ... replace with BC547) if ULA ok. Change the LM1889 ... cure 99% of Speccy faults. Whilst you're doing ... -
Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?
... a thermal fault, could be ULA, Z80, ROM, RAM (etc etc ... find about 95% of thermal faults IMO. -
GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…
... ! (I do, however, remove the ULA - that's been consistently in ... ). The only trouble is the typical IC socket has plastic with ... -
What WAS going to be bundled with Bandersnatch?Just saw a documentary about the death of Imagine ( [url]http://video.google.com/videoplay?docid=-1012096952890708986[/url] ) and apparently they wer…
... of replacing the Spectrum's ULA. Still, even that sort of ... was being charged for a typical game at the time.
speed of my Broadband connectionI have done a speed test on my Broadband connection and got a result of 2.5 and 4.2 megabits, the thing is i have just upgraded my connection to 20me…
... to be piggybacked. Unfortunately, the typical cable TV provider is a ... router. It has it's faults compared to the Netgear, but ...I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... chips like the CPU and ULA to suffer SCR latchup (CMOS ... anything critical.
The ULA is a bit of a ... a Spectrum project - not a ULA replacement, but for a CP2200 ... a circuit diagram showing the typical application). A switch mode supply ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... when it boots. Low ram faults often cause the black screen ... thing caused by a duff ULA.
Worth checking for ... dry joints on the ULA socket with a magnifying glass ...Video output (48K)Hello! I've made video mod on my Zx Spectrum. Now the problem of scanning (and tuning) to right channel is history for me. But, now I have another …
Also i have rolling lines on the lower part of the screen. I think is "digital noise", maybe a bad voltage decoupling on the ULA chip. If i have one PERITEL (RGB) adaptator this will help to eliminate faults on PAL encoder chip (LM1889).Spectrum more loved than C64It just occurred to me that the Spectrum must be more loved than the C64 these days. After all, it has been more than a year since an update was made…
... if you are lucky dead ULA if not though one project ... understanding.
Keyboard membrane faults are quite common also and ...Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…
... with it.
The typical dead 48K Spectrum (with black ... some functional checks on the ULA, showing the results on 8 ...Tape loadersi understand how ROM tape loader works but i dont understand why it so 'complicated'. it measure time until two edges in signal appears. why it does…
... to know what state the ULA tape output was, so you ... be too long for a typical domestic tape recorder is a ...The official Doctor Who threadOH MY GOD! I did [b]NOT[/b] see that coming at the end of the episode!
... typed pages of it's faults (admittedly in my opinion, but ... 't be bothered. It was typical Russell T. Davis - soap opera ... or interest, and vola! A typical Russell T. Davis episode. Another ...The official Doctor Who threadOH MY GOD! I did [b]NOT[/b] see that coming at the end of the episode!
... typed pages of it's faults (admittedly in my opinion, but ... 't be bothered. It was typical Russell T. Davis - soap opera ... or interest, and vola! A typical Russell T. Davis episode. Another ...48K Spectrum gone deaf?Hi Someone recently gave me a rubber-keyed 48k ZX Spectrum which they'd tucked under a bed for years and said needed repairing. I tested it using m…
... Spectrum with too many faults to be worth repairing ... others (such as memory, ULA etc. - parts that aren ... Speccy try swapping the ULA. That will immediately eliminate ... the socket to the ULA. Look at the schematic ... diode) until it reaches the ULA.
In ...Where are the spectrum?Hi guys, SINCLAIR made over 1000000 spectrums, where the hell are they?
... to bring life to others (ULA transplants, etc.), and many still ... /> Answering the topic question in typical WOS style: I still have ...Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... board to check for obvious faults, melted components, cracked PCB traces ... socketed IC's (normally only ULA) - swap with known working ones ...Spectrum+ from ebayI recently received a Spectrum+ that I bought off ebay for about ?10 including postage. I have not tested it yet but had a quick look inside through …
... remember. Spectrums were all ULA, transistor and RAM faults, or combinations thereof ... had experience of CPU related faults?.[/QUOTE]
Hello alien8r33d, I ...So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…
... />
[QUOTE]As for the ULA's clock output, it actually ... are some Xilinx docs with typical V vs. I graphs - but ...48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... Sinclair selling 48KB machines with faults as 16KB machines...[/quote]
ULA) directly soldered. I presume this ...Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…
... read in Chris Smith's ULA Book"[/i], which is slightly ... [/img]
If so, what typical values should be used for ...48k rubber key screen corruption[IMG][URL=http://img195.imageshack.us/i/img7398g.jpg/][IMG]http://img195.imageshack.us/img195/5563/img7398g.th.jpg[/IMG][/URL] Uploaded with [URL=htt…
... at least I know the ULA is ok.[/QUOTE]
... a [I]known working ULA[/I] into this machine ... ULA' (and it's always possible there are multiple faults).< ... br />
Or: you put [I]this[/I] ULA ... ]would[/I] be a dead ULA, right? :???:
...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
Spectrum 48k Issue 6a 1984 149-464865 Portugal, Dead ULA, possible memory faultsWhere's it all going?[Rerouted from 'Assembler Intricacies' in Development Forum] [QUOTE=Timmy;506104]I don't think we're in disagreement here. As I've said it's a niche…
... graphics don't get drawn. Typical sprite implementations will draw background ... screen is drawn by the ula. Whether it ever gets done ...Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... don't know if the ULA or whatever could have been ... even most of it's faults were likable, and gave it ...Amstrad Toast Rack?Hello there my fellow WoS'ers Recently I have been very lucky with my brother giving me a Sinclair Spectrum 128K+ (Toast Rack), it needed a little a…
... put a heatsink on the ula in the grey+2 when ... had power).
The ULA is an Amstrad model and ... a heatsink made with the typical heatsink of a 7805 spectrum ... my spectrum, they changed the ULA and put this "handmade" heatsink ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... on how to repair differing faults (that are now most ... you can do to isolate faults:
BORDER: if ... or your ROM, or the ULA itself, or it may be ... boot, but then hangs. ULA, Z80 and ROM seemed to ... that the attribute value the ULA is reading is not ...Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... to 'synchronise' Z80-rfsh and ULA-ras. Typical Sinclair then.
